I seem to have a problem in compiling the shaders in the tutorials.
I've learned my lesson and the Main.h file points to the right place. Being as it's the tutorial file, the engine.pak file should also be up-to-date.

I guess it must have been the wrong path, because the error message has changed. However, I was sure that it was right. I even copied the path directly from terminal to avoid making any mistakes.

In any case, the error I now get is:
Shader Param "_Material._ambient_specular" not found

I seem to recall that those kind of errors occur when the engine.pak is out of date. However, I've run autoupdate and this hasn't helped. I've also tried ensuring that I'm using the latest version of the shader headers, which I figured might be out of date.